中文摘要：

提出了一种加载密度周期变化等离子体圆波导的周期慢波结构即加载密度轴向正弦变化等离子体圆。波导的介质周期慢波结构，并研究了TM波在该介质结构中的传播特性，根据严格的理论推导得出TM波在其中传播的色散方程并进行了数值计算和分析．

英文摘要：

The interaction between the plasma and electromagnetic wave is a focus of the study of high-power microwave devices, loading plasma can significantly increase the output power and efficiency of microwave devices. This paper shows a kind of new periodic slow-wave structure in which plasma with periodic density is loaded into cylindrical waveguide, this is a periodic medium slow-wave structure. Also, the study of the propagation characteristics of electromagnetic wave in the structure is done, according to strict theory deduction, the dispersion equations are derived, and the numerical calculation and analysis are completed.